I have used watch for some time can no longer run so selling the watch some scratches on the watch strap has been repaired body
has use on see photos for condition of watch is working supplied with USB lead and box

Technical specifications

General

  • Operating temperature: -20° C to +60° C/-5° F to +140° F
  • Battery charging temperature: 0° C to +35° C/+32° F to +95° F
  • Storage temperature: -30° C to +60° C/-22° F to +140° F
  • Water resistance: 100 m/328 ft
  • Battery: rechargeable lithium-ion battery
  • Battery life: 10-40 hours with GPS, depending on conditions

Optical sensor

  • Optical heart rate by Valencell